Nonlinear kernels, dominance, and envirotyping data increase the accuracy of genome-based prediction in multi-environment trials

Autor(es)

Costa-Neto, Germano ^[1] ; Fritsche-Neto, Roberto ^[1] ; Crossa, Jose ^{[2, 3]}

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Luiz de Queiroz Agr Coll, Dept Genet, Sao Paulo - Brazil

^[2] Int Maize & Wheat Improvement Ctr CIMMYT, Biometr & Stat Unit, Genet Resources Program, Mexico City, DF - Mexico

^[3] Int Maize & Wheat Improvement Ctr CIMMYT, Global Wheat Program, Mexico City, DF - Mexico

• Tipo de documento: Artigo Científico
• Fonte: HEREDITY; v. 126, n. 1 AUG 2020.
• Citações Web of Science: 10

Resumo

Modern whole-genome prediction (WGP) frameworks that focus on multi-environment trials (MET) integrate large-scale genomics, phenomics, and envirotyping data. However, the more complex the statistical model, the longer the computational processing times, which do not always result in accuracy gains. We investigated the use of new kernel methods and modeling structures involving genomics and nongenomic sources of variation in two MET maize data sets. Five WGP models were considered, advancing in complexity from a main-effect additive model (A) to more complex structures, including dominance deviations (D), genotype x environment interaction (AE and DE), and the reaction-norm model using environmental covariables (W) and their interaction with A and D (AW + DW). A combination of those models built with three different kernel methods, Gaussian kernel (GK), Deep kernel (DK), and the benchmark genomic best linear-unbiased predictor (GBLUP/GB), was tested under three prediction scenarios: newly developed hybrids (CV1), sparse MET conditions (CV2), and new environments (CV0). GK and DK outperformed GB in prediction accuracy and reduction of computation time (similar to up to 20%) under all model-kernel scenarios. GK was more efficient in capturing the variation due to A + AE and D + DE effects and translated it into accuracy gains (similar to up to 85% compared with GB). DK provided more consistent predictions, even for more complex structures such as W + AW + DW. Our results suggest that DK and GK are more efficient in translating model complexity into accuracy, and more suitable for including dominance and reaction-norm effects in a biologically accurate and faster way. (AU)

• Processo FAPESP: 17/24327-0 - TCGA: um painel de germoplasmas de milho tropical para estudos de predição genômica e fenotipagem de alto rendimento
• Beneficiário: Roberto Fritsche Neto
• Modalidade de apoio: Auxílio à Pesquisa - Regular